CH 25 Flashcards
(MOR) system system of mountain ranges on the seafloor seperated by valleys
mid-ocean ridge
a long, narrow depression
rift valley
the boundary where two plates collide
convergent plate boundary
the denser plate dives beneath the continent in process
subduction
the boundary between two plates that are moving apart
divergent plate boundary
this type of boundary where plates slide horizontally past each other in the opposite directions
transform plate boundary
is a sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in the earth’s crust called faults
earthquake
is a crack in earths crust along which rock has moved
fault
this sudden release of strain of energy as rock moves along a fault
elastic rebound
the point of origin for an earthquake
focus
the point on earths surface directly above focus
epicenter
who came up with contentail drift hypothesis
Alfred wegener
what are some evidence for the Continental drift
1: Alfred wegener observed that the eastern coastline and the south america fit together like a puzzle peace
2: wegener argued that you could match rock types , Fosels
what was the name of the supper continental drift
1: Pangaea
who came up with the seafloor spreading hypothesis
harry Hess used some sonar to discover three dimensional maps (M O R) was found
how did harry Hess find the seafloor ?
he discovered an mid-ocean ridge
where at on the ocean floor were is the newer rock formed
closer to the ( M O R ) is where the new rock is formed where magma is continues to form and get bigger and the sea floor spreads and when the magma meets the ocean floor it cools
what are the types of plate bounders
divergent boundary
convergent boundary
transform boundary
theere is alos only one transport boundary
how do convergent plates move
they collide together
seduction only happens with type of plate boundary
what types of crust do we have ?
what cam be created when two oceanic plates come together
volcanic islands
how do divergent plate boundaries move
they move away from one each other
<
>
what is an example of a divergent plate boundaries
the (M O R ) “ocean range is one example of a divergent plate boundary
only (oceanic crust )
east African rift (only cont entail crust)
how do transform plate boundary’s plates move ?
they slide past each other
what type of crust is with transform plate boundary’s
what is a convection currant ?
1: magma heats up, becomes less dense,and rises
2: magma cools, becomes more dense, sinks/falls
what is an earthquake
1: an earthquake is a sudden movement with a crack in the earths surface which is called a fault.
which plate boundary’s have shallow earthquakes.
- divergent
2. transform / these are our shallow
which plate boundary’s have the deepest earthquakes
- convergent plate boundary’s are the deepest earthquake
what are the four types of stress are applied to rocks
- compression when pushed together 2.tension when pulled apart
- shear is when is twisting /and torsion stress
what are the two types of deformation
- elastic: when the stress is removed it turns to its original shape
- plastic:when stress is removed it remains in the same shape
how many types of size mic waves are there ?
there are 3 types
1: primary waves
2: secondary
3: surface waves
what are the two types of body waves?
1: ( p-waves) are known as primary waves
2: secondary waves: can be called (s-waves)
what type of wave is a primary wave?
1: compression is a primary wave( are also the fadstest
what body wave is the fastest?
the fastest is primary wave
what body wave is the fastest?
the fastest is primary wave
what type of materials do primary waves travel through?
what type of material secondary waves travel through?
1: they travel through solids
what type of waves do the most damage
1: surface waves do the most damage because they move up and down and cause the most damage when they move
what are the two scales to measure earthquakes
1 : the Richter magnitude
2: Mercalli
what does the Ricter scale measure
the amount of energy realest
what does the mercalli scale measure
1 the amount of damage is measured by the mercalli scale
